From patchwork Thu Jul 15 03:36:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 12378939 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 56885C07E96 for ; Thu, 15 Jul 2021 05:18:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3C7A061360 for ; Thu, 15 Jul 2021 05:18:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239493AbhGOFUx (ORCPT ); Thu, 15 Jul 2021 01:20:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40044 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231416AbhGOFUx (ORCPT ); Thu, 15 Jul 2021 01:20:53 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A961CC06175F; Wed, 14 Jul 2021 22:18:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=XSVu9BD9UXyayvt5uQ2+uc7bv/kdPYe5szu7lOLynCY=; b=u9j66Nhyd2T2mKoEpFk4ZTqySc s1JyoYspmyrcUimIIwLwMCxNiAHEhTA9cfqzkGZURBK9Osb0U5Gic6j+mr6R82/8m5Vp8bcyPDZ1/ SparFb5JuiJC5GjoIh8W4TZqXYzPjBAeGUOW83k3X3x9wpi4QMhr2uWzrDM3AG0i5aNtpvbDpnW+0 TJPa5xDOxxxLNmt+yao4bIk2RgfYJ74js758tYofr+1HPwVsV4O5vEmggfHp9/u9uMLcZMDAYGXio AO5EuvX+tyZVg2GWsW7PAxzuCuLnZsousQCfQGdDbfgnEls5TDaYsV9fgo5MXfLfEjSsjvvZW4LF2 QHOZxmfA==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1m3tkA-0030cA-Bz; Thu, 15 Jul 2021 05:17:24 +0000 From: "Matthew Wilcox (Oracle)" To: linux-kernel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v14 124/138] fs: Convert vfs_dedupe_file_range_compare to folios Date: Thu, 15 Jul 2021 04:36:50 +0100 Message-Id: <20210715033704.692967-125-willy@infradead.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210715033704.692967-1-willy@infradead.org> References: <20210715033704.692967-1-willy@infradead.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org We still only operate on a single page of data at a time due to using kmap(). A more complex implementation would work on each page in a folio, but it's not clear that such a complex implementation would be worthwhile. Signed-off-by: Matthew Wilcox (Oracle) --- fs/remap_range.c | 116 ++++++++++++++++++++++------------------------- 1 file changed, 55 insertions(+), 61 deletions(-) diff --git a/fs/remap_range.c b/fs/remap_range.c index e4a5fdd7ad7b..886e6ed2c6c2 100644 --- a/fs/remap_range.c +++ b/fs/remap_range.c @@ -158,41 +158,41 @@ static int generic_remap_check_len(struct inode *inode_in, } /* Read a page's worth of file data into the page cache. */ -static struct page *vfs_dedupe_get_page(struct inode *inode, loff_t offset) +static struct folio *vfs_dedupe_get_folio(struct inode *inode, loff_t pos) { - struct page *page; + struct folio *folio; - page = read_mapping_page(inode->i_mapping, offset >> PAGE_SHIFT, NULL); - if (IS_ERR(page)) - return page; - if (!PageUptodate(page)) { - put_page(page); + folio = read_mapping_folio(inode->i_mapping, pos >> PAGE_SHIFT, NULL); + if (IS_ERR(folio)) + return folio; + if (!folio_test_uptodate(folio)) { + folio_put(folio); return ERR_PTR(-EIO); } - return page; + return folio; } /* - * Lock two pages, ensuring that we lock in offset order if the pages are from - * the same file. + * Lock two folios, ensuring that we lock in offset order if the folios + * are from the same file. */ -static void vfs_lock_two_pages(struct page *page1, struct page *page2) +static void vfs_lock_two_folios(struct folio *folio1, struct folio *folio2) { /* Always lock in order of increasing index. */ - if (page1->index > page2->index) - swap(page1, page2); + if (folio1->index > folio2->index) + swap(folio1, folio2); - lock_page(page1); - if (page1 != page2) - lock_page(page2); + folio_lock(folio1); + if (folio1 != folio2) + folio_lock(folio2); } -/* Unlock two pages, being careful not to unlock the same page twice. */ -static void vfs_unlock_two_pages(struct page *page1, struct page *page2) +/* Unlock two folios, being careful not to unlock the same folio twice. */ +static void vfs_unlock_two_folios(struct folio *folio1, struct folio *folio2) { - unlock_page(page1); - if (page1 != page2) - unlock_page(page2); + folio_unlock(folio1); + if (folio1 != folio2) + folio_unlock(folio2); } /* @@ -200,77 +200,71 @@ static void vfs_unlock_two_pages(struct page *page1, struct page *page2) * Caller must have locked both inodes to prevent write races. */ static int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, - struct inode *dest, loff_t destoff, + struct inode *dest, loff_t dstoff, loff_t len, bool *is_same) { - loff_t src_poff; - loff_t dest_poff; - void *src_addr; - void *dest_addr; - struct page *src_page; - struct page *dest_page; - loff_t cmp_len; - bool same; - int error; - - error = -EINVAL; - same = true; + bool same = true; + int error = -EINVAL; + while (len) { - src_poff = srcoff & (PAGE_SIZE - 1); - dest_poff = destoff & (PAGE_SIZE - 1); - cmp_len = min(PAGE_SIZE - src_poff, - PAGE_SIZE - dest_poff); + struct folio *src_folio, *dst_folio; + void *src_addr, *dst_addr; + loff_t cmp_len = min(PAGE_SIZE - offset_in_page(srcoff), + PAGE_SIZE - offset_in_page(dstoff)); + cmp_len = min(cmp_len, len); if (cmp_len <= 0) goto out_error; - src_page = vfs_dedupe_get_page(src, srcoff); - if (IS_ERR(src_page)) { - error = PTR_ERR(src_page); + src_folio = vfs_dedupe_get_folio(src, srcoff); + if (IS_ERR(src_folio)) { + error = PTR_ERR(src_folio); goto out_error; } - dest_page = vfs_dedupe_get_page(dest, destoff); - if (IS_ERR(dest_page)) { - error = PTR_ERR(dest_page); - put_page(src_page); + dst_folio = vfs_dedupe_get_folio(dest, dstoff); + if (IS_ERR(dst_folio)) { + error = PTR_ERR(dst_folio); + folio_put(src_folio); goto out_error; } - vfs_lock_two_pages(src_page, dest_page); + vfs_lock_two_folios(src_folio, dst_folio); /* - * Now that we've locked both pages, make sure they're still + * Now that we've locked both folios, make sure they're still * mapped to the file data we're interested in. If not, * someone is invalidating pages on us and we lose. */ - if (!PageUptodate(src_page) || !PageUptodate(dest_page) || - src_page->mapping != src->i_mapping || - dest_page->mapping != dest->i_mapping) { + if (!folio_test_uptodate(src_folio) || !folio_test_uptodate(dst_folio) || + src_folio->mapping != src->i_mapping || + dst_folio->mapping != dest->i_mapping) { same = false; goto unlock; } - src_addr = kmap_atomic(src_page); - dest_addr = kmap_atomic(dest_page); + src_addr = kmap_local_folio(src_folio, + offset_in_folio(src_folio, srcoff)); + dst_addr = kmap_local_folio(dst_folio, + offset_in_folio(dst_folio, dstoff)); - flush_dcache_page(src_page); - flush_dcache_page(dest_page); + flush_dcache_folio(src_folio); + flush_dcache_folio(dst_folio); - if (memcmp(src_addr + src_poff, dest_addr + dest_poff, cmp_len)) + if (memcmp(src_addr, dst_addr, cmp_len)) same = false; - kunmap_atomic(dest_addr); - kunmap_atomic(src_addr); + kunmap_local(dst_addr); + kunmap_local(src_addr); unlock: - vfs_unlock_two_pages(src_page, dest_page); - put_page(dest_page); - put_page(src_page); + vfs_unlock_two_folios(src_folio, dst_folio); + folio_put(dst_folio); + folio_put(src_folio); if (!same) break; srcoff += cmp_len; - destoff += cmp_len; + dstoff += cmp_len; len -= cmp_len; }